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Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell

Author

Listed:
  • Jinjae Kim

    (Seoul National University
    Seoul National University)

  • Jiwon Park

    (Seoul National University
    Seoul National University)

  • Hyojin Choi

    (Seoul National University
    Seoul National University)

  • Taeho Kim

    (Pohang University of Science and Technology
    Institute for Basic Science (IBS))

  • Soonyoung Cha

    (University of California)

  • Yewon Lee

    (Pohang University of Science and Technology
    Institute for Basic Science (IBS))

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Jonghwan Kim

    (Pohang University of Science and Technology
    Institute for Basic Science (IBS))

  • Moon-Ho Jo

    (Pohang University of Science and Technology
    Institute for Basic Science (IBS))

  • Hyunyong Choi

    (Seoul National University
    Seoul National University)

Abstract

Moiré superlattices of transition metal dichalcogenides offer a unique platform to explore correlated exciton physics with optical spectroscopy. Whereas the spatially modulated potentials evoke that the exciton resonances are distinct depending on a site in a moiré supercell, there have been no clear demonstration how the moiré excitons trapped in different sites dynamically interact with the doped carriers; so far the exciton-electron dynamic interactions were presumed to be site-dependent. Thus, the transient emergence of nonequilibrium correlations are open questions, but existing studies are limited to steady-state optical measurements. Here we report experimental fingerprints of site-dependent exciton correlations under continuous-wave as well as ultrashort optical excitations. In near-zero angle-aligned WSe2/WS2 heterobilayers, we observe intriguing polarization switching and strongly enhanced Pauli blocking near the Mott insulating state, dictating the dominant correlation-driven effects. When the twist angle is near 60°, no such correlations are observed, suggesting the strong dependence of atomic registry in moiré supercell configuration. Our studies open the door to largely unexplored nonequilibrium correlations of excitons in moiré superlattices.

Suggested Citation

  • Jinjae Kim & Jiwon Park & Hyojin Choi & Taeho Kim & Soonyoung Cha & Yewon Lee & Kenji Watanabe & Takashi Taniguchi & Jonghwan Kim & Moon-Ho Jo & Hyunyong Choi, 2024. "Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47768-6
    DOI: 10.1038/s41467-024-47768-6
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